CHARLES SCHAEFFER. 275 



interspaces wider and slightly convex, tesselated with black and pale spots; scu- 

 tellum white. Body beneath sparsely clothed with greyish pubescence. Legs 

 black, tibiae near base and first joint of tarsi at base pale; second and third tarsal 

 joints scarcely wider than first. Length 6.50 mm. 



Huachuca Mts., Arizona, collected by Mr. Gustav Beyer, to whom 

 I am indebted for the single male. 



According to the description, this species must be near aJternans 

 from South America, but the legs are differently colored and the 

 eighth antennal joint is not four times as long as apically broad. 

 From our North American species it will easily be recognized by the 

 markings of the elytra and by the form of the eighth antennal joint, 

 which is similar to that of vurstus. The third ventral segment is 

 feebly convex at middle. 



The males of mixtus have on the third ventral segment a small 

 tubercle at middle, and the eyes are emarginate, but very feebly. 



AR^ODERES n. gen. 



Head flat, immersed in the thorax as far as the eyes ; beak more 

 than twice as wide as long, truncate at apex, sides straight, covering 

 the antennal cavities ; eyes convex, rounded, not oblique, truncate- 

 emarginate in front of antennal cavities; antennal cavities trans- 

 verse, occupying the whole length of the beak and close to the eyes ; 

 antennae reaching to the hind angles of prothorax, first and second 

 joints equal, much stouter than the others, third joint slightly 

 smaller than fourth, fourth to eighth gradually decreasing in length, 

 ninth to eleventh forming a loose club ; false mentum broadly emar- 

 ginate, lobes rounded at tip. Prothorax convex, nearly twice as 

 wide at base than long, dorsally longer than laterally. Carina 

 basal, feebly arcuate, extending at sides to the front angles, hind 

 angles rectangular. Elytra convex, about twice as long as the pro- 

 thorax, gradually declivous at apex, humeri rounded, apices sinuate 

 before the sutural angles, coarsely striate-punctate. Tarsi short, 

 second joint covering the third, claws cleft. Anterior coxcie nar- 

 rowly separated, mesosternal process vertical, slightly narrower at 

 tip and truncate. 



Type. — Arceoderes texanus n. sp. 



Judging from the description, this genus seems to be allied to 

 Picenia Pascoe, and is best placed between Euparius {Cratoparis) 

 and Brachytarsus of our fauna. 



TBANS. AM. ENT. SOC. XXXII. SEPTEMBER, 1906. 



